Crystal detector and cmp



Dec. 13, 1927. 1,652,927

J. BUCHANAN CRYSTAL DETECTOR AND CLIP Filed June 1924 ATTOR N EYPatented Dec. 13, 1927.

JoriN Bo cr r'ANaN; or Noam iiimionocx, PENNSYLVANIA.

CRYSTAL 'nnrncron AND CLIP.

I j Application filed June. 2,

This invention relates'to holding and'connecting devices, andmoreiparticularly'to a crystal detector and clips for use in connectionwith radio receiving sets employing detector crystals.

One of the main objects of the invention is to provide a device of thecharacter stated of simple construction and operation which maybereadily produced and applied at very small cost. A further object is toprovide a device in which the crystal is efiectually held againstdisplacement,,the holding means being provided with sharp or pointedelements which contact with the crystal, these elements, due to theirsmall cross-area, re-

placing the usual small wire or cat-whisker commonly employed inconnection with detector crystals. -A further object is to providesimple and etficient means whereby the crystal holder may be readilyconnected to the receiving set and the phones may be readily connectedto the holder, it being understood that the holder is formed ofelectrical conducting material. A further object is to provide a clip orsecuring device of simple and highly eflicient construction which may beemployed in place of the usual binding post for connecting together oneor more electrical conductors. Further objects will appear from thedetail description.

In the drawings Fig. 1 is a top plan view of the device as used;

Fig. 2 is a side view;

Fig. 3 is a fragmentary inner face view of one ofthe crystals securingand holding members;

Fig. 4 is a side view of the device adapted for use as a clip.

The device includes two strips of brass or other suitable material eachof which is bent to provide a jaw or holding member 1 which is disposedat right angles to an arm 2which is bent over upon itself to form anupper arm 2 disposed parallel with and closely adjacent to the uppersurface of arm 2. The arms 2 and 2 are connected by an eye 3 and arm 2is bent up to form a transversely extending recess or groove-whichforms, with arm 2, a socket 4. The membeis thus formed are secured byscrews b, or in any other suitable or preferred manner, to a panel baseB with the jaws or holdingmembers 1 disposed in spaced parallel relationto receive between them a crystal C of galena or other suitablematerial. The eyes 3 and sockets wardly projecting points 1*.

1924.-- Serial No. 717,411.

4; provide, in effect, sockets for reception of the terminal members 6of fiexible wires 7 which maybe connected to the usual head phones, andfor the terminal elements of wires 8 by means'of which the crystal isconnected to the receiving set. This provides very simple and efficientmeans whereby the crystal is connected to the set and the phones may beconnected to the crystal in proper relation. Arm 2*, due to its inherentresiliency, ensures that the terminal elements of the wires 7 and 8 willbe securely held thus procuring proper contact, it being understood thatthe strips of brass used in forming the holding and securing members areof proper gauge and resiliency to obtain this effect.

. As will be noted more clearly from Fig. 3, each of the holding membersor jaws l is cut and punched to provide a plurality of in- These pointsare disposed to contact with and grip crystal 0 thus effectuallysecuring the crystal against displacement, the holding members beingheld in close contact with the crystal due to their inherent resiliency,it being understood that these members are spread slightly when thecrystal is inserted. The fine points 1 contact with the crystal and, dueto their very small cross-area, act in the same manner as thecat-whisker which is frequently employed in crystal detectors, thepoints 1 which contact with sensitive spots on the crystal remainingfixed relative to the crystal so as not to be displaced by jars ormovement of the receiving set. In this respect the device is decidedlysuperior to the ordinary type of crystal detector employing acat-whisker as the cat-whisker is very easily displaced from a sensitivespot on the crystal thus necessitating readjustment of the detector.

The arms 2 and 2 provide a clip. which may be used in connection withthe crystal holding member 1 or, if desired, can be used to replace theusual binding post used in connection with receiving sets. I have shownthe device used as a clip, the holding member 1 being omitted. In thisdevice the strip of brass is bent to provide In Fig. 4

a horizontal arm or base 2 extending from of the terminals of olectricwires omconductors thus providing simple: andemciemt means wherebyelectrical connections may be readily establishedbetween twowires 01-conductors Without the necessity "of employ- I! pmeizrredionm only nf'myinvention is disclosed.

What I claim is A lcombinedradio terminal and crystal holder comprisinga pair 'of righta-ngular ing binding screws and similar elements.:ehstio metal-strips apertured for set screws As will be understood thenumber of sockets provided in the clip may be wariedwsasdesired ornecessary and other changes in details of construction 11nd mrrangementof parts of the inventmn 'may'be resorted to Without departing frointhefield and-scope of the same, and Iintend to inclnde all suchvariations,- -as fall Wl-thlIYthBSGBPQ of'the appended claim,*in'thi'swpplicati'on inwlrich for mounting on an insulated support, thebnse'element hm ing a folded end forming an elastic terminal socket, thevertical member having indentations toelastically g rnsp a*rectifyi'ngcrystal.

In "testimony whereof 'I affix 'nlysignatnre.

ZTGHN BU GHANAN.

